I was going to 'Guess' the same thing. Make sure if it can fit through the sides of the basket that it has a tether secured to the fall protection point.
Similar situation, but we've prepped all the soldering below so we don't have to solder up top. We're running multiple runs of RGB LED tape around a portal, so it's lots of screwing down holder clips and making splice connections. My gut reaction was to say no to the chair, but couldn't really justify it; It's just not done.@Lightguy5
I built a two level work bench sized to straddle between a scissor lift's hand rails, one surface at hand rail height with ~2" edges above the bench's work surface to prevent tools from escaping and a second level shelf with only an open front ~4 - 5" below the work surface. This let me have my Panavise, Soldering station, solder sucker, heat shrink gun and a few hand tools handy on the upper surface with a few more items below on the open-faced shelf.
Chair: Yes, definitely, a chair low enough to accommodate me seated at my bench soldering and heat shrinking.